There is a 5x5 field containing a few mines. When you click on a cell, you either hit a mine or see an empty cell. When your click results in an empty cell your balance grows whereas hitting a mine leads to your bet subtraction from your balance.
Balance is measured in the in-game credits. 1 credit = 0.0000001 ETH.
The minimum bet is 1 credit / 0.0000001 ETH.
The maximum bet is equal to your balance, but not exceeding 500K credits / 0.05 ETH.
Mine positions are chosen at the start of every round and can be verified after the round ends. This is accomplished by using 2 strings: a secret string containing mine positions and a hash string that is calculated from the secret string using a well-known SHA-256 hashing algorithm. When a game starts, you see the SHA-256 hash string to ensure that the secret string will not change when you make a bet. When you make a bet, the secret string is revealed along with the bet result. At this point you can check that the hash string is corresponding to the revealed secret using one of the third-party websites like this one or another one.
The structure of the secret is as follows: <mine_pos_1>[-<mine_pos_2>[...[-<mine_pos_N>]]]__<salt>.
For instance, a secret 10-13-25__11f5544e3d1c0a6a means that mines are located in positions 10, 13 and 25. Mine positions start from 1 in the top left corner of the field and then enumerated from left to right, top to bottom.
100K credits / 0.01 ETH.
There is no precise answer to this question, it is a volatile amount of gas and you may refer to this link for more info: https://ethgasstation.info/.
No, you cannot. You can play only after transaction confirmation.
You can cancel your deposit and send ETH again with higher transaction price.
Any wallet that supports ETH transactions.